DISEASE (half yearly)

Question 1

LESSON 2
What are the steps involved in the stimulus-response pathway?

Answer 1

• Stimulus
• Sense Organs / Receptor
• Sensory Neuron
• CNS & Relay Neuron
• Motor Neuron
• Effector / Muscles and Glands
• Response

Question 2

LESSON 2
Identify the components of the Central Nervous System (CNS)

Answer 2

• Brain
• Spinal Cord

Question 3

LESSON 2
Identify the components of the Peripheral Nervous System (PNS)

Answer 3

• Nerve cells
• Sense organs

Question 4

LESSON 3
Identify 3 examples of stimuli

Answer 4

Any sound or any object

Some examples:
- A glass of water
- Sand
- A soccer ball

Question 5

LESSON 3
Identify the 5 sense organs that detect stimuli and their role in triggering the response.

Answer 5

• Skin (touch): detects pressure and pain
• Ears (sound): detects sound waves
• Nose (smell): detects chemical smells in the air
• Eye (sight): detects light
• Tongue (taste): detects chemicals in foods & drinks

Question 6

LESSON 3
Describe a REFLEX ACTION and how it protects your body from harm

Answer 6

Reflex actions are:
Automatic responses to stimuli.

They protect us by creating fast responses to potentially harmful stimuli.

Question 7

What does the relay neuron do?

Answer 7

Processes impulses from the brain and connects the sensory neuron to the motor neuron.

Question 8

What does the motor neuron do?

Answer 8

Carry impulses from brain and spinal cord to muscles and glands

Question 9

What do sensory neurons do?

Answer 9

They carry impulses from the sense organs to your spinal cord and brain

Question 10

What is the function of an axon?

Answer 10

It carries messages up and down the body